When people call up Leigh Jerrard, founder of Greywater Corps, they're greeted with a recorded message: "Note that we are overwhelmed with inquiries right now, so it may be a while before we get back to you. But have faith."
Jerrard's company helps homeowners with the complicated process of installing their own Greywater systems. The system takes drainage from showers or washing machines and uses it to water lawns.
It sounds like a great idea now but six years ago, when Jerrard started the company, few people were interested.